I made up this box three years ago...
Earlier this spring I added an electronic flasher into the box for the running lights
and I had found one of those aviation type toggle switch covers for the brake switch to avoid accidentally flipping that switch.
It has an aux 12v receptacle and I think a 15 amp circuit breaker.
It was a fun project, but since I used a lot of marine hardware the price added up some. But it was what I find a fun project what with researching the parts, planning the wiring, etc.